[Jewelry making - Article 01353] - Re: [Orchid] Purple Silver?

[jesse brennan]

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    loosely  from Brepohl's   " The theory and practice of
    Goldsmithing": 

    Up to about 5 %   aluminum is soluble  in  the solid alloy.   The
    color is even whiter than usual and the rate of oxidation is
    increased. These alloys  result in embrittlement.  During melting
    and annealing  Aluminum oxide  can be easily formed in the grain
    boundaries  and cause the metal to break into pieces. 

    From somewhere else-- where I don't remember -- traces of aluminum
    acting as a deoxidant  may help  produce a non tarnishing sterling. 

    Other technical references I have do not mention  silver- aluminum
    alloys. jesse


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